两种体质颜料对桦木漆膜理化及燃烧性能的影响

Effects of two kinds of extender pigments on the paint film combustion and properties of the birch

采用CaCO3、CaSO4两种体质颜料加入聚氨酯清漆中配成两种不同涂料,及以不添加体质颜料的聚氨酯清漆,分别对桦木表面涂饰,通过测试漆膜表面光泽度、漆膜附着力、漆膜耐磨性及燃烧性能,比较桦木表面漆膜性能的变化。结果表明,加入CaCO3体质颜料的涂料漆膜耐磨性最好。体质颜料加入的质量比对漆膜附着力有一定影响,当体质颜料与聚氨酯清漆质量比低于150∶66时,体质颜料的加入量对漆膜附着力没有影响;当体质颜料与聚氨酯清漆质量比超过200∶66时,体质颜料的增加会降低漆膜附着力。CaSO4体质颜料热释放速率曲线第2高峰到达时间比桦木推迟了45 s,有效燃烧热最低,比消光面积增大,剩余物质质量比最高,加入该体质颜料具有一定的阻燃效果。

CaCO3 and CaSO4 were used as the extender pigment mixed into the polyurethane varnish and polyurethane varnish. The three kinds of materials dubbed in different finishing processes, and the obtained paints were used for sur- face decoration of birch. The paper separately tested the basic material finishing process to the surface glossiness, film adhesion, the film wear resistance and fire retardant properties. The change of film properties was discussed. The resuhs showed that the coatings containing CaCO3 extender pigment had the best wear resistance. The amount of extender pig- ment had a certain influence on the adhesion of film. When the mass ratio of extender pigment to PU was less than 150： 66, the adding amount of extender pigment had no effect on the adhesion of the film. When the mass ratio of ex- tender pigment to PU exceeded 200： 66, the increase of the extender pigment would reduce the adhesion of coating. The arrival time of second peak in the heat release rate curves of CaSO4 extender pigment was delayed 45 s less than birch. At the same time, the effective heat of combustion decreased, specific extinction area increased, the residual mass ratio was the highest. All these indicated that this extender pigment had a certain degree of flame retardancy.